A cylinder block is a block of four (two bilingual pairs) showing the printing cylinder number in the margin.
The war effort block of 12 is an arrow block - if you look in the slogans on the top margin there is a printed arrow show where the sheets should be separated.
The arrow block is rouletted vertically. The rouletting was used because it was too difficult to change the current perforating apparatus on the printing system to suit the smaller format of the stamps. This one is rouletted 6.5
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Posted 05/03/2011 5:57 pm
